Schmidty5.0

Anybody tryna help with a troubleshooting issue?? Hit about 110mph today on a good straight away and saw white smoke coming from god knows where… (can’t tell if it’s from exhaust or under the hood but it was obvious as I looked out my side mirror to see damn near a cloud of smoke). This is the second time it’s happened and it only occurs when I hit somewhere above 100mph. No engine light, coolant reservoir is filled , no noticeable leaks, and no overheating engine. My instant thought was head gasket but with no engine light or overheating issues, I’m stuck wondering what else it could be and can’t seem to find anything on the internet. Im driving a 2018 gt premium with kooks long tubes and 93 octane tune. I don’t have any issue driving at normal speeds in terms of seeing smoke or anything so I’m kinda clueless. I was thinking the tune could be running a little lean but it wouldn’t explain white smoke as lean normally causes some black smoke if it smokes at all. I can give more details if needed for a better suggestion but if anybody could help before I have to spend hundreds getting it checked out by my dealership, that would be awesome